WE received a post card from USAIR  not to be confused with the real deal which is
US Airways..

Be careful, as you know there "AINT" no free lunch - prefix is India and do not give out credit card
information if you are not sure of who you are calling.

The disclaimer saying they're not affiliated with "US Airlines" is a screamer too.  Those geniuses can't even get the airline's name right in the fine print.

Received 10/31/11 a postcard with same info as indicated above by fremdling.  I, too, thought it odd that US Air as such, does not exist  but rather US Airways.  That detail alone indicates that this is some sort of scam.  The Postage Paid right upper corner indicates the Permit is from West Palm Beach, FL.  The postcard also indicates 'WE HAVE BEEN TRYING TO CONTACT YOU (THIS IS NOT A TIMESHARE OR LAND SALE OFFER'.  Exactly what is this?  I plan to throw this postcard away since there is no way that a trip could be free with fares plus surcharges are high from any standpoint.  Anything that sounds urgent is suspect and this card requires recipient to call within 48 hours any day of the week.
In very fine print lower left corner of postcard are the folowing sentences:  'Certain restrictions apply.  Call for details of participation.  This offer is not sponsored by or affiliated with US Airlines but they are a major supplier.  Taxes and reservation fees are the responsibility of the recipient.  Offer void where prohibited by law.  Not appllicable to Alaska or Hawaii.'
I do not call toll-free numbers that appear on my Caller ID so am unsure whether this company is calling anyone or merely taking the easy way out by sending postcards rather than calling people.

Post card, no return address no website.scammmmmm!

This is a scam.  I got a postcard from "US Air" (the real company is US Airways) that says I have been selected to receive 2 round trip airfares anywhere "US Air" flies in the continental US, plus a 3-day 2-night hotel stay if I call within 48 hours.  A trace of this number came up on India Trace with the prefix 91.  Thanks for the offer, "US Air," but don't hold your breath waiting for me to call you.